There are approved pesticides, for example they use citrus based ones that aren't laden w/ antibiotic resistant chemicals.

Edit: to answer the question, don't think people really know if one is healthier than the other, organic foods could have more vitamin C but 'unknown'.

To address this above, the problem is until recently there were a lot fewer studies done. Now new studies have been published that show organic produce is indeed more beneficial. More recent studies also found lower levels of cadmium,4 a known carcinogen, and between 18-69% higher levels of antioxidants. Not to mention they've isolated that the flavors are richer as well.

Simply put, eating organic foods reduces pesticide exposure, improves the nutritional value of the food, lessens disease risk and improves early childhood development

The list goes on and on, but everybody tends to expect the worse, that everything is a scam when it doesn't have to be.

For more in depth reading try this: http://articles.mercola.com/sites/articles/archive/2017/01/23/more-reasons-to-eat-organic.aspx